Non-volatile memory devices and systems with volatile memory features and methods for operating the same
Memory devices, systems including memory devices, and methods of operating memory devices and systems are provided, in which at least a subset of a non-volatile memory array is configured to behave as a volatile memory by erasing or degrading data in the event of a changed power condition such as a power-loss event, a power-off event, or a power-on event. In one embodiment of the present technology, a memory device is provided, comprising a non-volatile memory array, and circuitry configured to store one or more addresses of the non-volatile memory array, to detect a changed power condition of the memory device, and to erase or degrade data at the one or more addresses in response to detecting the changed power condition.
1. A memory device, comprising:
a non-volatile memory array; and
circuitry configured to:
store one or more addresses of the non-volatile memory array in a write-once read-many (WORM) memory of the memory device;
detect a changed power condition of the memory device; and
degrade data at the one or more addresses in response to detecting the changed power condition by overwriting the data at the one or more addresses with a pseudorandom pattern.
2. The memory device of claim 1 , wherein the changed power condition is a power-on event, a power-off event, or a power-loss event.
3. The memory device of claim 1 , wherein the circuitry is further configured to:
write the one or more addresses to the write-once ready-many (WORM) memory in response to a command received at the memory device.
4. The memory device of claim 1 , wherein the write-once read-many (WORM) memory comprises an array of fuses, anti-fuses, or a combination thereof.
5. The memory device of claim 1 , further comprising an energy storage mechanism.
6. The memory device of claim 5 , wherein the energy storage mechanism comprises a capacitor, a battery, a fuel cell, or a combination thereof.
7. The memory device of claim 5 , wherein the energy storage mechanism has an energy storage capacity sufficient to provide power for the duration of the erasing data at the one or more addresses.
8. The memory device of claim 1 , wherein the non-volatile memory array comprises NAND flash, NOR flash, MRAM, FeRAM, PCM, or a combination thereof.
9. The memory device of claim 1 , wherein a single semiconductor die comprises the non-volatile memory array and the circuitry.
10. The memory device of claim 1 , wherein a memory controller die comprises the circuitry and a memory die comprises the non-volatile memory array.
11. A method of operating a memory device including a non-volatile memory array, the method comprising:
storing, in a write-once read-many (WORM) memory of the memory device, one or more addresses of the non-volatile memory array;
detecting a changed power condition of the memory device; and
in response to the detection, degrading data at the one or more addresses of the non-volatile memory by overwriting the data at the one or more addresses with a pseudorandom pattern.
12. The method of claim 11 , wherein the changed power condition is a power-on event, a power-off event, or a power-loss event.
13. The method of claim 11 , further comprising:
writing the one or more addresses to the write-once ready-many (WORM) memory in response to a command received at the memory device.
14. The method of claim 11 , wherein the write-once read-many (WORM) memory comprises an array of fuses, anti-fuses, or a combination thereof.
15. The method of claim 11 , wherein the non-volatile memory array comprises NAND flash, NOR flash, MRAM, FeRAM, PCM, or a combination thereof.